Low‐expansion solid solution surface layers formed by chemical reactions at high temperatures were used to chemically strengthen alumina and spinel bodies. Solid solutions in the system Al 2 O 3 ‐Cr 2 O 3 strengthened alumina, and solid solutions in the system MgO·Al 2 O 3 ‐MgO·Cr 2 O 3 strengthened spinel. Prior treatments with aqueous hydrofluoric acid were used to remove intergranular material and increase the thickness of the solid solution layers. The relative compressive stresses, distribution of the flexural strengths, and thermal shock resistance of the strengthened materials were investigated.
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Kirchner et al. (1967) studied this question.
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